"""Unit tests for the Finding schema + thread-metadata helpers."""

from __future__ import annotations

from typing import Any
from unittest.mock import AsyncMock, patch

import pytest

from agent.reviewer_findings import (
    SEVERITY_ORDER,
    Finding,
    append_finding,
    filter_findings_for_publish,
    list_findings,
    mutate_findings,
    new_finding,
    new_finding_id,
    replace_findings,
    resolve_review_head_sha,
    set_reviewer_thread_metadata,
    update_finding_fields,
)


def _f(**overrides: Any) -> Finding:
    base = new_finding(
        severity="high",
        confidence="high",
        category="correctness",
        file="foo.py",
        start_line=10,
        end_line=10,
        description="boom",
        sha="abc123",
    )
    base.update(overrides)  # type: ignore[arg-type]
    return base


def test_new_finding_id_format() -> None:
    fid = new_finding_id()
    assert fid.startswith("f_")
    assert len(fid) == len("f_") + 10


def test_new_finding_defaults() -> None:
    finding = _f()
    assert finding["status"] == "open"
    assert finding["side"] == "RIGHT"
    assert finding["first_seen_sha"] == "abc123"
    assert finding["last_confirmed_sha"] == "abc123"
    assert finding["github_review_id"] is None
    assert finding["github_review_comment_id"] is None
    assert finding["github_review_comment_ids"] == []
    assert finding["github_review_thread_id"] is None
    assert finding["github_review_thread_ids"] == []
    assert finding["github_review_run_id"] is None
    assert finding["github_thread_resolved"] is False
    assert finding["github_resolved_thread_ids"] == []
    assert finding["last_human_reply_at"] is None
    assert finding["resolution_note"] is None
    assert finding["suggestion"] is None


def test_severity_order_monotonic() -> None:
    assert (
        SEVERITY_ORDER["low"]
        < SEVERITY_ORDER["medium"]
        < SEVERITY_ORDER["high"]
        < SEVERITY_ORDER["critical"]
    )


def test_filter_findings_for_publish_drops_below_threshold_and_resolved() -> None:
    findings = [
        _f(id="f_a", severity="high", file="a.py", start_line=1, end_line=1),
        _f(id="f_b", severity="low", file="b.py"),
        _f(id="f_c", severity="critical", file="c.py", start_line=2, end_line=2),
        _f(id="f_d", severity="high", file="d.py", status="resolved"),
    ]
    surfaced = filter_findings_for_publish(findings, severity_threshold="medium", cap=10)
    assert [f["id"] for f in surfaced] == ["f_c", "f_a"]


def test_filter_findings_for_publish_caps_results() -> None:
    findings = [_f(id=f"f_{i}", severity="high", file=f"f{i}.py") for i in range(20)]
    surfaced = filter_findings_for_publish(findings, severity_threshold="medium", cap=5)
    assert len(surfaced) == 5


@pytest.mark.asyncio
async def test_list_findings_returns_empty_on_missing_metadata() -> None:
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {}}
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        findings = await list_findings("tid")
    assert findings == []


@pytest.mark.asyncio
async def test_list_findings_coerces_bad_entries() -> None:
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {
        "metadata": {
            "findings": [
                {"id": "f_ok", "severity": "high", "file": "x.py"},
                {"missing_id": True},
                "not-a-dict",
            ]
        }
    }
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        findings = await list_findings("tid")
    assert [f["id"] for f in findings] == ["f_ok"]


@pytest.mark.asyncio
async def test_replace_findings_calls_threads_update() -> None:
    fake_client = AsyncMock()
    findings = [_f(id="f_x")]
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        await replace_findings("tid", findings)
    fake_client.threads.update.assert_awaited_once_with(
        thread_id="tid", metadata={"findings": findings}
    )


@pytest.mark.asyncio
async def test_append_finding_appends_to_existing_list() -> None:
    existing = _f(id="f_a")
    new = _f(id="f_b")

    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"findings": [existing]}}

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        result = await append_finding("tid", new)

    assert result["id"] == "f_b"
    args = fake_client.threads.update.await_args
    persisted = args.kwargs["metadata"]["findings"]
    assert [f["id"] for f in persisted] == ["f_a", "f_b"]


@pytest.mark.asyncio
async def test_mutate_findings_reads_latest_before_mutating() -> None:
    """mutate_findings must operate on the freshest persisted list, not a stale
    snapshot — the mutator receives whatever ``list_findings`` returns now."""
    latest = [_f(id="f_fresh")]
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"findings": latest}}

    seen: list[str] = []

    def _mutator(findings: list[Finding]) -> bool:
        seen.extend(f["id"] for f in findings)
        findings[0]["status"] = "resolved"
        return True

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        result = await mutate_findings("tid", _mutator)

    assert seen == ["f_fresh"]
    assert result[0]["status"] == "resolved"
    fake_client.threads.update.assert_awaited_once()


@pytest.mark.asyncio
async def test_mutate_findings_skips_write_when_unchanged() -> None:
    """A no-op mutation must NOT persist, so it can never clobber a concurrent
    update that landed between the read and a would-be write."""
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"findings": [_f(id="f_a")]}}

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        await mutate_findings("tid", lambda _findings: False)

    fake_client.threads.update.assert_not_called()


@pytest.mark.asyncio
async def test_update_finding_fields_mutates_only_target() -> None:
    a = _f(id="f_a", description="orig-a")
    b = _f(id="f_b", description="orig-b")

    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"findings": [a, b]}}

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        updated = await update_finding_fields("tid", "f_b", {"status": "resolved"})

    assert updated is not None
    assert updated["status"] == "resolved"
    persisted = fake_client.threads.update.await_args.kwargs["metadata"]["findings"]
    by_id = {f["id"]: f for f in persisted}
    assert by_id["f_a"]["status"] == "open"
    assert by_id["f_b"]["status"] == "resolved"


@pytest.mark.asyncio
async def test_update_finding_fields_returns_none_for_unknown_id() -> None:
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"findings": [_f(id="f_a")]}}
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        result = await update_finding_fields("tid", "f_missing", {"status": "resolved"})
    assert result is None
    fake_client.threads.update.assert_not_called()


@pytest.mark.asyncio
async def test_set_reviewer_thread_metadata_includes_kind() -> None:
    fake_client = AsyncMock()
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        await set_reviewer_thread_metadata("tid", watch=True, last_reviewed_sha="sha")
    metadata = fake_client.threads.update.await_args.kwargs["metadata"]
    assert metadata["kind"] == "reviewer"
    assert metadata["watch"] is True
    assert metadata["last_reviewed_sha"] == "sha"
    assert "pr" not in metadata
    assert "findings" not in metadata


@pytest.mark.asyncio
async def test_set_reviewer_thread_metadata_persists_head_sha() -> None:
    fake_client = AsyncMock()
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        await set_reviewer_thread_metadata("tid", head_sha="newhead")
    metadata = fake_client.threads.update.await_args.kwargs["metadata"]
    assert metadata["head_sha"] == "newhead"


@pytest.mark.asyncio
async def test_resolve_review_head_sha_prefers_metadata_over_config() -> None:
    """A mid-run push records the live head in thread metadata; it must win over
    the stale head frozen in the run's config."""
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {"head_sha": "metahead"}}
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        head = await resolve_review_head_sha("tid", {"head_sha": "confighead"})
    assert head == "metahead"


@pytest.mark.asyncio
async def test_resolve_review_head_sha_falls_back_to_config_when_metadata_empty() -> None:
    fake_client = AsyncMock()
    fake_client.threads.get.return_value = {"metadata": {}}
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        head = await resolve_review_head_sha("tid", {"head_sha": "confighead"})
    assert head == "confighead"


@pytest.mark.asyncio
async def test_resolve_review_head_sha_falls_back_without_thread_id() -> None:
    fake_client = AsyncMock()
    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        head = await resolve_review_head_sha("", {"head_sha": "confighead"})
    assert head == "confighead"
    fake_client.threads.get.assert_not_called()


@pytest.mark.asyncio
async def test_replace_findings_raises_domain_error_when_thread_missing() -> None:
    import httpx
    from langgraph_sdk.errors import NotFoundError

    from agent.reviewer_findings import ReviewerThreadMissingError

    not_found = NotFoundError(
        "thread tid not found",
        response=httpx.Response(404, request=httpx.Request("PATCH", "http://x")),
        body=None,
    )
    fake_client = AsyncMock()
    fake_client.threads.update.side_effect = not_found

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        with pytest.raises(ReviewerThreadMissingError) as excinfo:
            await replace_findings("tid", [_f(id="f_a")])

    assert excinfo.value.thread_id == "tid"
    assert "not found" in str(excinfo.value)


def _not_found(method: str = "GET") -> Exception:
    import httpx
    from langgraph_sdk.errors import NotFoundError

    return NotFoundError(
        "thread tid not found",
        response=httpx.Response(404, request=httpx.Request(method, "http://x")),
        body=None,
    )


@pytest.mark.asyncio
async def test_get_thread_metadata_raises_domain_error_when_thread_missing() -> None:
    """A missing thread must surface as ReviewerThreadMissingError, not be
    swallowed into ``{}`` — that produced misleading tool results like
    "No finding found" instead of the do-not-retry contract."""
    from agent.reviewer_findings import ReviewerThreadMissingError, get_thread_metadata

    fake_client = AsyncMock()
    fake_client.threads.get.side_effect = _not_found()

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        with pytest.raises(ReviewerThreadMissingError):
            await get_thread_metadata("tid")


@pytest.mark.asyncio
async def test_get_thread_metadata_still_degrades_on_other_failures() -> None:
    from agent.reviewer_findings import get_thread_metadata

    fake_client = AsyncMock()
    fake_client.threads.get.side_effect = RuntimeError("transient")

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        assert await get_thread_metadata("tid") == {}


@pytest.mark.asyncio
async def test_set_reviewer_thread_metadata_raises_domain_error_when_thread_missing() -> None:
    from agent.reviewer_findings import (
        ReviewerThreadMissingError,
        set_reviewer_thread_metadata,
    )

    fake_client = AsyncMock()
    fake_client.threads.update.side_effect = _not_found("PATCH")

    with patch("agent.reviewer_findings.get_client", return_value=fake_client):
        with pytest.raises(ReviewerThreadMissingError):
            await set_reviewer_thread_metadata("tid", last_reviewed_sha="sha")